how much loss are we talking about here? you could try cutting a hole at the bottom, sometimes the ridges at the top of the bag like ziplocks catch powders

Not much, but I could still see granules and oil clinging to the inside of the bags after I dumped them. I tried the hole in the corner and then pressing down the sides of the bag with my finger and thumb, but I still feel like I didn't get about 5 percent.